Balanced crank-shaft.



A. C. HERTHEL.

BALANCED CRANK SHAFT.

APPLICATION FILED NOV.26. I917.

1,261,527. Patented Apr. 2, 1918.

180 the ARTHUR C. HERTHEL, F DAYTON, OHIO.

BALANCED CRANK-SHAFT.

Specification of Letters Patent.

Patented Apr. 2, 1918 Application filed November 26, 1917. Serial No. 203,872.

To all whom it may concern:

Be it known that I, ARTHUR C. Hmnnn a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Balanced Crank- -Shafts, of which the following is a specification.

This invention relates to balanced crankshafts and has for its ob'ect the, making of counter-balances for cran -shafts easily and accurately adjustable. Heretofore in suh structures the counter-balancing elements have. usually been merel cast or otherwise 16 roughly formed, witht 'e result that discrepancies in weight in a counter-balance produces errors for which com sation must be made by other count'eralances.

With the device of this invention the coun- 2d ter-balancing can be made so accurate that no vibration willbe caused by discrepancies in the counter-balances themselves and vi- 1 bration of the shaft can be cured to a nicety by the. accuracy with which .these counter- -'l5 balances can be adjusted by .the means herein-dcscribed. a

In the accom anying drawin forming art of this specification, in whic like numrs of reference denote like parts wherever occur, igure 1 is a side elevation in which the counter-balance weights are shown UPSldG down as compared to Fi 2, 8, 4, and 5;

Fig. 2 is a sectionalvlew on the line 2-2 85 in Fig. 1, looking in the direction of the arrows, but on an cnlar d scale;

Fi 3 is an enlarge side elevation of a cran arm and counter-balance;

Fig. 4 is a section on an enlarged scale on the line 4-4 in Fig. 1;

Fig. 5 is a view taken at a right angle to Figfti is a perspective .view of a box for- Babbitt metal as a means of attachment or bearing for the adjustment bolts- Fig. 7 is a perspective view of one of the nuts for makin adjustment of the counterbalancing weig ts;

Fig. 8 is a sectional detail through such nut and a bolt passing therethrough, and a cotter pin for holding the same in adjusted position; and

Fig. 9 is a section on a reduced scale on the line 99 in Fig. 2.

56 The main shaft 1 of the crank shaft communicates power through the clutch 2 to the 22, which cotter oles 23 in nuts 24 and 25, and drill through drive shaft 8 connected with the transmission. The timing gear 4 is mounted on the main shaft 1. v

The corners of the crank arms 5 are customarily made slanting, as at 6, to overcome which when this invention is used, a box 7 for Babbitt metal is used to square such corners, as clearly shown in Fig. 1, so as 00 afford a fiat bearin surface for the heads 8 of bolts 9, of whic there are four for the attachment of each counterrbalancing weight 10, as indicated by the bolt holes 11 in the rear wall of box 7.

Counter-sinks 12 in wei ht 10 receive the ends of bolts 9 and also t e nuts 13 which -are at the opposite ends oibbgits 9 from ttie r against 6 heads 8. T e'bolt heads 8 rear wall: of box 7 or in the construction shown in Figs. 4 and 5 for attachment of the counter-balancing weight late the 'c'ollar'15,

on the connectingrod 16, the said bolt heads 8 bear against t e plates 17, wll lich 'lasre attached by Babbitt metal 18 to co ar In the attachment of weights 10 to' crank arms 5, the boxes 7 are lfut on, while the- Babbitt metal is soft, an the bolts 9 run through the holes 11 in'such box and through. the passages '19 in crank-arm-5 and through the passages 20 in weight 10 to the countersinks 12, where the ends of bolts 9 receive the nuts 13.

The nuts 21 draw bolts 9 into tight relation to crank arm'5, and a cotter pin 22 that passes through one of theholes 23 in nut 21 and also through a transverse hole throu h bolt 9 (as best seen in Fig. 8) tightly ho bolts 9 in fixed relation when once set. A duprlicate nut 21 and cotter pin 22 acts as to. 10 nut for the nuts 21 nearest to arm 5. Although the ends of bolts 9 adjacent to nuts 13 and-as far as their oint of emergence from arm 5 ate threaded, the passages 20 are not threaded, and-rafter the nuts 21 have been screwed to thq'position shown in Fi 2, the weight 10 can slide freely upon bo ts 9. Nuts 24 and lock-nuts 25 are each provided with a cotter pin like the cotter ins pass through the bolt; 9 opposite the same.

After bolts 9 have'been secured in arm -5 by nuts 21, as hereinbefore desc bed, the threaded ends of bolts 9 are pushed through passages 28 so as slightly to enter into slots 27, in which nuts 2* and 25have been placed so as to thread upon bolts 9 as the said bolts enter the said slots. Rotation of the nuts 2d and 25 threads the said nuts farther on the bolts 9, gradually drawing weight 10 along bol s 9, and nuts 24 and 2 occupy the position de icted in Fig. 2. In the drawings, slots i are necessarily exaggerated in size, but "in fact nuts 24 and 25 will fit very closely therein.

he adjusting is done with nuts 2'! and 25 which move in either direction upon the threaded part of bolts 9. B this construction the weight 10 may be rawn nearer to the crank arm 5 or pushed farther out, the pull and push bein exercised by the threads within nuts 241m 25 and on bolts 9. Accurel adjustment to the precise degree 'desired will be, made by nuts 24 and 25 whereupon the same-will be fixed by cotter pins and locked by. nuts 25 through which cotter pins 22 also pass, the aid cotter pins extendin from one side of nuts 24 and 25 throng bolts 9 and out at-the opposite side of the said nuts; Thevad'ustm ent of the nuts24 and 25 will be ma 0 by a spanner wrench in a well understood manner, which will permit of "the nuts 24 and 25 being drawn so tightly as to produce precise y the ad'ustment desired. The nuts 13 are screw home with a socket wrench to, the position shown in Fig. 2, and serve as lock nuts. 4 r j Usually on the eonnectingrodrhearings 16a collar 15 having more or le rough surface is found, which makes necessary the use of Babbitt metal 18 and the relatively smooth plate 1.7 to allord even bearing for the bolt, heads 8, and'this construction is du licated at the opposite side of the said col ar 15. for the bearing of nuts 21. The bolts 9 pass through the main shaft-1 in the attachment of the weight 10 to crank arms 5 and other bolts 9 pass through the connectingrod bearing 16 in the attachment to collar 15 of the wei ht 14..

The weight 10 or t 10 weight 14 need not be of the shape shown in the drawings, but may be of any suitable form. It need not .be attached to the particular crank arm or other art shown in the drawing, but if desire may beelsewhere-located. t may be divided into parts and in that way distributcd as may be desired. These weights will be so arranged that one-half of their aggregate will be on one side. and the other ha f on the other side of the axis of rotation of the main crankshaft 1.

The Babbitt metal is poured into box 7 throu h hole 26 after cap or'box 7 has been suitab y placed in; situ upon bolts 9.

Screw studs' tha only slight] enter'the crank-shaft may be substituted or the bolts at all points where such bolts 9 are shown 11: the drawingg' and if desired the boxes 1 and Babbitt will lay. al o, mead.

Having thus described this invention, I hereby reserve the benefit of all changes in form, arrangement, order, or use of parts, as it is evi cut that many minor changes may be made therein without departing fromthe spirit of this invention, or the. see c of the following claims.

claim:

L In a balanced crank shaft, the combination of a weight having passages therethrough, bolts fixed in their relation to the crank shaft and lpassing through the passages in the sair weight, stationary nuts on the said bolts and adjusting nuts thereon.

2. In a balanced crank-shaft, the combination of bolts having a fixed relation relative to the said. crank shaft and extending outwardly therefrom, a weight mounted relative to the, said bolts, nuts for limiting the travel of the said weight relative to the said b ts, and other nuts in connection with the sai bolts for adjusting the said weights inward or outward relative to the axis of rotation. of the crank-shaft.

3. In a balanced crank-shaft, the combination of bolts having a fixed relation shaft, there being unthreaded' relative to the said ciank-shaftand extending outwardly therefrom a int:

Ill

mounted. relative to the said bolts, nuts or limiting the travel of the said weight rela- .tive to the said bolts, and other nuts in mnnection with the said bolts for-"adjusting the said weights inward or outward relative to the axis of rotation of the-crank- PMS through the said weight for the pamg gof the said bolts. l

4. In a balanced crank-shaft, the com:

bination of boltshaving a fixed relation relative to the said crank-shaft and extends ing outwardly therefrom, a weight mounted relative to the said bolts, nuts for limiting l JUI La inward or outward relative to the axis of rotation of the crank-shaft, there being unthreaded passages through the said 'wei ht for the passage of the said bolts an a countersink in the said weights adjacent the e. d of each of the said bolts to receive the said nuts adapted to act as a stop.

5. In a balanced crank-shaft, the combination of bolts havin a fixed relation relative to the said cran -shaft and extending outwardly therefrom, a weight mounted relative to the said bolts, nuts for limiting the travelof the said weight relative to'the said bolts, and other nuts in connection with the said bolts for adjusting the said weights inward or outward relative to the axis of rotation' of the crank-shaft, th're. being unthreaded passages through the said wei ht for the passage of the said'bolts, there mg a cap on an appropriate part of the said the travel of the said weight relative to the bolts passin crank-shaft to afl'ord even bearing for the heads of the said bolts.

6. In a balanced crank-shaft, the combination of bolts having a fixed relation relative to the said crank-shaft and extending outwardly therefrom, a weight mounted relative to the said bolts, nuts for limiting the travel of the said weight relative to the said bolts, and other nuts in connection with the said bolts for adjusting the said weights 'inward or outward relative to the axis of rotation of the crank-shaft, there being nuthrcaded passages through the said weight for the passage of the said bolts, there being a cap on an appropriate part of the sai crank-shaft to afford evenbearing for the heads of the said bolts, and Babbitt m'etal for its attachment to the crank-shaft.

7. In a balanced crank-shaft, the combination of bolts having a fixed relation relative to the said crank-shaft and the said bolts, nuts for limiting the travel of the said weight relative to the said bolts, and other nuts in connection with the said bolts for adjusting the said weights inward or outward rcla tive to the axis of rotation of the crank-shaft, there being unthreaded passages through the said weight for the passage of the said bolts, there being a ca on an appropriate part of said crank-she. to afford even bearing for the heads of the said bolts, and Babbitt metal for its attachment tothe crank-shaft, the said cap being shaped like a box. w

8. In a balanced crank-shaft, the combination of bolts havin tive to the said cran -shaft and extending outwardly therefrom, a weight mounted relative to the said bolts, nuts for limiting the travel of the said weight relative'to the saidv bolts, and other nuts in connection with the said bolts for adjusting the said weights inward or outward relative to the axis of rotation of the crank-shaft, there being unthreaded passages through the said weight for the passage of the said bolts, the said through passa leading through longitudinal as well as ateral parts of the crank-shaft.

9. In a balanced crank-shaft, the combia fixed relation relanation of bolts having a fixed relation relative to the said crank-shaft and extending outwardly therefrom, a weight mounted relati o to the said bolts, nuts forlimiting the tra of the said weight relative to the said bolts, and other nuts in connection with the said bolts-for adjusting the said weights in ward or outward relative to the axis of retation of the crank-shaft, there being nnthrcadcd passages through the said weight for the passage of the said bolts, the said bolts passing through passages leading through longitudinal as well as lateral parts of the crank-shaft, and being tied thereto by nuts.

10. In a balanced crank-shaft, the combination of bolts having a fixed relation relative to the said crank-shaft and extending outwardly therefrom, a weight mounted relative to the said bolts, nuts for limiting the 'travel of the said weight relative to the said bolts, andother nuts in connection with the said bolts for adjusting the said weights in,- ward or outward relative to the axis of rotation of.the crank-shaft, there being unthreaded passages through the said weight for the passage of'the said bolts, the said bolts assing through passa es leading throng longitudinal as well as lateral parts of the crank-shaft, and being tied thereto b nuts, the said nuts being provided with bores and the said bolts being provided with bores adapted to register with the said bores through the nuts and cotter pins adapted for insertion through such registering bores.

'11. A counter-balance for a crank-shaft comprising a plurality of bolts passing through a part of the said crankshaft, nuts for fastenin the same to the said crank shaft in tig t relation, a weight adapted to be adjusted upon outward extensions of the bolts, stops upon the extremities of the said bolts to hold the said weight upon-the said bolts and adjusting nuts adapted to move the said weight toward or from the axis of rotation of the crank-shaft.

In testimony whereof I hereunto atfix my signature.

ARTHUR o. iiERTHEL. 

